Saturation mechanisms of backward stimulated Raman scattering in a one-dimensional geometry

被引：20

作者：

Friou, A. ^{[1
]}

Benisti, D. ^{[1
]}

Gremillet, L. ^{[1
]}

Lefebvre, E. ^{[1
]}

Morice, O. ^{[1
]}

Siminos, E. ^{[2
]}

Strozzi, D. J. ^{[3
]}

机构：

[1] CEA, DIF, DAM, F-91297 Arpajon, France

[2] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany

[3] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

来源：

PHYSICS OF PLASMAS | 2013年 / 20卷 / 10期

关键词：

PARAMETRIC-INSTABILITIES; BRILLOUIN-SCATTERING; DECAY INSTABILITY; FREQUENCY-SHIFT; ELECTRON; ENHANCEMENT; WAVES;

D O I：

10.1063/1.4823714

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

In this paper, we investigate the saturation mechanisms of backward stimulated Raman scattering (BSRS) induced by nonlinear kinetic effects. In particular, we stress the importance of accounting for both the nonlinear frequency shift of the electron plasma wave and the growth of sidebands, in order to understand what stops the coherent growth of Raman scattering. Using a Bernstein-Greene-Kruskal approach, we provide an estimate for the maximum amplitude reached by a BSRS-driven plasma wave after the phase of monotonic growth. This estimate is in very good agreement with the results from kinetic simulations of stimulated Raman scattering using both a Vlasov and a Particle in Cell code. Our analysis, which may be generalized to a multidimensional geometry, should provide a means to estimate the limits of backward Raman amplification or the effectiveness of strategies that aim at strongly reducing Raman reflectivity in a fusion plasma. (C) 2013 AIP Publishing LLC.

引用

页数：15

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